Looks like the thread is getting hijacked. More traffic about the hammer than fixing the tractor. Good save there, by the way.
The hammer looks, to me, like a very old version of a B&O, with the end cut back. I have no idea what the B&O means, it's what the millwrights call it. Has a long handle, like a sledge. One side, the hammer(?), is for striking with a heavy sledge. The other side is a pin punch. Varying sizes depending on the application. The long handle to keep the user/ holder clear of sparks and glancing blows by the guy slinging the hammer. Usually a large sledge, 16 or more pounds.
When the pin punch gets beyond economical use, such as bent or broken, it often ends up cut back and made into a (relatively small) sledge itself. You got to watch the balance when you grind it back. But it makes a very good hand sledge, like a drilling hammer but a little heavier.
Working in the "hot" side of a steel mill gives a lot of insight into many crafts. The casters where I was made a "slab" that was 10 inches thick, by anywhere from 3 to 8 feet wide. At 40 inches a minute, downtime was quite costly and many corners were cut to keep it going. We went through B&Os like candy bars. And broken handle sledges. No time to replace a handle, just grab another and keep going. Electricians ended up with a lot of tools that way.
Bill Hudson